US1344229A - Girder - Google Patents

Description

W. S. HUTCHINSON.

GIRDER.

APPLICATION FILED ocr. 5. I9I7.

2 SHEETS-SHEE'I l.

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GIRDER.

APPLICATION FILED OCT. 5, I9I7.

2 SHEETS-SHEEI 2.

UNITED STATES PATENT OFFICE.

WILLIAM S.' HUTCHINSON, OF BETHLEHEM, PENNSYLVANIA.

GIRDER.

Application led October 5, 1917. Serial No. 194,874.

To all whom it may concern:

Be it known thatI, WILLIAM S. HUTCH- rNsoN, a citizen of the United States, and a resident of Bethlehem, in the county of Northampton and State of Pennsylvania, have made a new and useful Invention in Gir-ders, of which the following is ay specification.

This invention relates to girders. Girdcrs as heretofore constructed utilize plates in their makeup and their cost therefore at this time is extremely high. i

I have found that by utilizing rolled shapes such as beams or channels placed together and securely fastened in suitable rclation I can form relatively cheap girders since plates are eliminated.

By securely fastening two rolled beams together one on top of the other, or several channels placed back to back to form the web of the girder, girders having an economic distribution of metal may be formed which require but simple detailing and fabrication. If H or other heavy sections are used for the flanges when bending is the determining factor great strength to resist flexure is obtained.

When shearing stresses are the determining factor the web is preferably made up of channel sections.

In the drawings, Figure 1 is a plan view of a double beam girder embodying this invention, the flanges of which are formed of channels; Fig. 2 is a side elevation of the same, and Fig. 3 is a cross section on line 3 3 Fig. 2. Fig. 4 is a plan view of a girder embodying this invention, the web portion and flanges of which are formed of channel sections; Fig. 5 is a side elevation of the same, and Fig. 6 is a view in cross section.

Referring to Figs. 1, 2 and 3, the web of the girder thus illustrated is formed of two I beams 7 and 8 riveted or otherwise secured together at 9, the flanges for the girders are formed of two channel sections 10 and`11 preferably riveted to the opposite ends of the web portion.

Referring to Figs. 4, 5 and 6, the web of the girder thus illustrated is made up of five channels 12, 13, 14, 15 and 16, the abutting flanges of channels 12 and 13 are riveted together and channels 14, 15 and 16 are similarly secured together with the joints staggered with relation to the joints between channels 12 and 13. The flanges are formed by channel sections 17 and 18 riveted to the outer flanges of the web portion. In such a beam the channels 12 and 13 are each ofr greater depth than the depth of the individual channels 14, 15, and 16,and the overall depth of the channels facing in one direction (channels 12 and 13) is equal to the overall depth of the channels facing in the other direction (channels 14, 15 and 16).

It will be seen that girders made in accordance with either of the disclosures of the drawings require but few vertical stiffeners because the beam or channel flanges act as web stiffeners along the entire length of the girder. But little bracing is also required because of the inherent lateral strength of the flanges.

When such girders are used in face walls the flanges act as anchors for terra-cotta or other wall finish and render other anchors unnecessary. When used in factories the flanges form ideal surfaces to which to attach shaft hangers.

In accordance with the provisions of the patent statutes I havedescribed the essential features of my invention, together with the forms which I now consider to represent the best embodiments thereof, butI desire to have it understood that the forms shown are only illustrative and that the invention can be carried out in other ways.

Having thus described my invention,what I claim as new and desire to secure by Letters Patent is- 1. A girder in which any section of the web comprises a plurality of channels, longitudinally arranged and back to back, with the back of one of said channels lapping the longitudinal joint between others of said channels.

2. A girder in which the web is composed of a plurality of channels arranged back to back and running longitudinally of the girder, the depth of each channel being different from the depth of the channel backed against it; the top and bottom chords of said girder each consisting of a rolled section secured to two of said oppositely facing chaning the overall depth of the assembled channels facing the opposite direction.

4,-In combination in a built up girder7 top and bottom flange members, and a web secured to said flange members and comprising channel members arranged back to back and secured together, one side of said web being formed of a greater number of channel members than the other side.

5. In combination in a built up girder, top and bottom flange members, and a web secured to said top and bottom members and made up of rolled sections placed back to back and secured together, one side of said web being formed of a greater number of rolled sections than the other side, but the overall depth of the assembled Web members on one side being equal to the overall depth or' the assembled web members on the other side of the web.

In testimony whereof I have hereuntosubscribed my name this first day of Octo-

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